            var t = n = 0, count;
            $(document).ready(function(){
                  count=$("#banner_list a").length;
                  $("#banner_list a:not(:first-child)").hide();
                  $("#banner_info").html($("#banner_list a:first-child").find("img").attr('alt'));
                  $("#banner_info").click(function(){
                        window.open($("#banner_list a:first-child").attr('href'), "_blank")});
            $("#banner li").click(function() {
            var i = $(this).text() - 1;//获取Li元素内的值，即1，2，3，4
            n = i;
            if (i >= count) return;
            $("#banner_info").html($("#banner_list a").eq(i).find("img").attr('alt'));
            $("#banner_info").unbind().click(function(){window.open($("#banner_list a").eq(i).attr('href'), "_blank")})
            $("#banner_list a").filter(":visible").fadeOut(500).parent().children().eq(i).fadeIn(1000);
            document.getElementById("banner").style.background="";
            $(this).toggleClass("on");
            $(this).siblings().removeAttr("class");
            });
            t = setInterval("showAuto()", 4000);
            $("#banner").hover(function(){clearInterval(t)}, function(){t = setInterval("showAuto()", 4000);});
            })

            function showAuto()
            {
            n = n >=(count - 1) ? 0 : ++n;
            $("#banner li").eq(n).trigger('click');
            }

